Sticking to Mach and being hostile to Linux wasn't very smart and a lot of developers have not forgiven the FSF for that, which is one reason they find the "GNU/Linux" label deeply insulting.
The other screw up was that they turned down the use of UZI, which would have given them a working if basic v7 Unix equivalent OS years before Linux was released. Had they done that Linux would never have happened and probably the great Windows battle would have been much more fascinating.
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